559214cbbd
Add a new boolean for units, SurviveFinalKillSignal=yes/no. Units that set it will not have their process receive the final sigterm/sigkill in the shutdown phase. This is implemented by checking if a process is part of a cgroup marked with a user.survive_final_kill_signal xattr (or a trusted xattr if we can't set a user one, which were added only in kernel v5.7 and are not supported in CentOS 8).
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